We have had our spot for a couple of years Franz at bullfrog spas in Layton was awesome and helped us select the right spa to fit in our space, when we were putting an addition on our house. For the first few months I tried to traditional chemicals and while it generally work if it ever got out of balance it was nearly impossible to balance it. About a year ago we tried silk balance and it worked extremely well. It has been a breeze to just add few ounces after we use the spa and it has been perfect every time. We travel extensively and even when we’re gone it seems to maintain the spot better than anything else we tried. Thanks, Allen & Leila Turner Layton, Utah